Serial Number between 10633051 and 10972000.Serial Number between 10574001 and 10972000.Serial Number between 10674301 and 10972000.

This is a limited problem that will not occur in any lenses other than those specifically listed above.

[Support for this problem]

To overcome this issue, we will be offering our customers an inspection and where applicable, a modification service, free of charge. In the case of any autofocus problem becoming apparent on inspection, we will rectify the situation through the help of our local authorized Sigma Service Stations.

We deeply apologize if any inconvenience has been caused to our customers.